Equal and Equivalent Sets

Two sets are equal if they both have the same members.

Example
If, F = {20, 60, 80}
And, G = {80, 60, 20}
Then, F=G, that is both sets are equal.

Note: The order in which the members of a set are written does not matter.

Two sets are equivalent if they have the same number of elements.

Example
If, F = {2, 4, 6, 8, 10}
And, G = {10, 12, 18, 20, 22}
Then, n(F)= n(G)= 5, that is, sets F and G are equivalent.